JPH04311858A - Tape guiding device - Google Patents

Abstract

PURPOSE:To reduce the number of parts, to simplify a mechanism, thus, to miniaturize a device and make the device low cost by providing a recessed part, screw to prevent a guiding member from rotating, a stopper plate and an ultrasonic exciter on a stopping member related to the lower flange of upper and the lower flanges to control a position in the lengthy direction of the guiding member. CONSTITUTION:This device is provided with the pipe-like guiding member 21 to guide a tape, the ultrasonic exciter 24 whose one end is a free end and the other end is fixed to the guiding member 21 and to vibrate the guiding member 21 with a standing wave and a supporting shaft 19 to support the guiding member 21. The recessed part 14a to prevent the guiding member 21 from rotating, the screw 27, the stopper plate 28 and the ultrasonic exciter 24 on the deteut member 14 related to the lower flange 14d of the upper and the lower flanges 12 and 14d to control the position in the lengthy direction the guiding member 21.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape guide device suitable for application to, for example, a video tape recorder.

0002

2. Description of the Related Art Tape guide devices used in video tape recorders and the like can be broadly classified into rotating types and fixed types. The rotating type has the characteristic that it applies less running resistance to the tape. However, for example, uneven rotation of the bearings used may manifest as uneven running of the tape, or if the running direction of the tape is not perpendicular to the rotating direction of the rotating roller, the tape will receive force in the width direction from the roller. There were disadvantages such as receiving Particularly in the latter drawback, the tape further moves in the width direction,
Sometimes the edges of the tape were damaged. Therefore, when a rotary tape guide device is used, the accuracy of parts and assembly must be extremely high, making manufacturing difficult. On the other hand, the fixed type allows the tape to run stably, but has the drawback of high tape running resistance. For these reasons, there is a demand for a fixed type tape guide device with low tape running resistance, and an air guide is one example. This air guide is of a type in which air is ejected from small holes provided on the surface of the guide body to levitate the tape and reduce the running resistance of the tape. However, even with this air guide, new problems arise, such as the need for a compressor as an air source. In order to solve these drawbacks and problems, the present applicant has previously proposed an ultrasonic vibrating tape guide device using ultrasonic waves (Japanese Patent Application No. 103627/1999). This ultrasonic vibrating tape guide device is designed to reduce tape running resistance while maintaining fixed tape running stability. Furthermore, the height of this ultrasonic vibration tape guide device is adjustable. This ultrasonic vibrating tape guide device will be explained below with reference to FIG.

In FIG. 9, reference numeral 5 denotes a main shaft mounted on a base 18. The ultrasonic vibrator 3 is fixed to the side surface of the guide member 2. Furthermore, an assembly of both will be referred to as a guide member system. The guide member 2 is supported by a cylindrical support shaft 7 having a support protrusion 7b. The lower and upper flanges 9 and 10 are arranged so as to abut the upper and lower ends of the support shaft 7, and serve to guide the edge portion of the tape wound around the guide member 2. The main shaft 5 is configured to pass through the lower and upper flanges 9 and 10 and the support shaft 7. Reference numeral 6 denotes a height adjustment screw that is fitted into the inner periphery of the upper end of the support shaft 7 and is screwed into a screw 23 formed at the end of the main shaft 5. 8 is a mounting member, and an upper flange 10 is attached to the upper part of this mounting member 8.
is fixed with mounting screws 15, and a lower flange 9 is fixed to the lower part of this mounting member 8 with fixing pins 22 and 24. As shown in FIG. 10, the element accommodating portion 8a of the mounting member 8 is configured by forming a rectangular parallelepiped hole with side walls 8b left on both sides, and a stopper fitting hole 8c is formed in both side walls 8b. .

A locking protrusion 39a of a disc-shaped stopper 39 made of rubber is fitted into the stopper fitting hole 8c.
By holding the ultrasonic vibrator 3 between the stoppers 39, rotation of the guide member 2 is prevented. The attachment member 8 serves to keep the lower and upper flanges 9 and 10 parallel, and to keep the distance between them approximately 0.1 mm larger than the length of the guide member 2. As shown in FIG. 9, the lower flange 9 is pushed upward by the biasing force of a coil spring 35 disposed around the outer periphery of the main shaft 5 between the lower flange 9 and the base 18. A pin insertion hole 20 is formed in the base 18 , and a fixing pin 22 erected on the lower surface of the lower flange 9 is inserted into this insertion hole 20 . In such a configuration, when the height adjustment screw 6 is rotated, the height of the guide member 2 can be adjusted by and against the biasing force of the coil spring 35. In FIG. 11, an AC voltage having a frequency corresponding to the resonant frequency of the guide member system is applied to the ultrasonic vibrator 3, and the guide member 2
The state of the standing wave vibration generated in the figure is expanded and displayed by cutting along the line X-X. As shown in FIG. 10, the dotted line NN is a node, and the amplitude is zero on this line. If the distance from the end surface of the guide member 2 to the node position is n, the position of the support protrusion 7b in the axial direction is provided at a distance of n from the end surface of the guide member 2.

[0005]

[Problem to be solved by the invention] By the way, the above-mentioned FIG.
In the tape guide device 1 described in , it is necessary to keep the upper and lower flanges 10 and 9 parallel to each other, and to keep the gap between them approximately 0.1 mm larger than the length of the guide member 2, so a highly accurate mounting member is required. 8 and also requires parts such as screws and pins to assemble them. Therefore, there is a problem that the device becomes larger. Further, the upper and lower flanges 10 and 9 used to regulate the width direction of the tape are preferably used so that either the upper or lower flange 10 or 9 of the tape guide device 1 is in contact with the tape. Generally, among the upper or lower flanges 10 or 9, the flange that comes into contact with the tape (upper or lower flange 10 or 9) is designed to perform the function of guiding the tape for a long period of time. A hard, wear-resistant material is used. Such materials generally have poor workability and are expensive when formed into complex shapes. However, in the tape guide device 1 described above with reference to FIG. 9, the shape of the upper flange 10 having the role of guiding the tape is complicated, as shown in FIG. 10. Therefore, there are disadvantages in that manufacturing becomes difficult and the device becomes expensive.

[0006] The present invention has been made in view of the above points, and it is an object of the present invention to propose a tape guide device that can reduce the number of parts and simplify the mechanism, thereby reducing the size and cost of the device. It is something to do.

[0007]

[Means for Solving the Problems] The tape guide device of the present invention, as shown in FIGS. 1 to 8, includes a pipe-shaped guide member 21 for guiding a tape, one end of which is a free end, and the other end of which is a guide member 21. In a tape guide device 17 consisting of an ultrasonic vibrator 24 that is fixed and makes the guide member 21 vibrate with a standing wave, and a support member 19 that supports the guide member 21, a rotation prevention means 14 that prevents the guide member 21 from rotating.
a, 27, 28, and 24 are provided on the member 14 related to at least one member 14d among the members 12 and 14d that regulate the position of the guide member 21 in the longitudinal direction.

[0008]

[Operation] According to the present invention described above, the rotation prevention means 14a, 27, 28, 24 for preventing rotation of the guide member 21 are connected to the member 12 for regulating the position of the guide member 21 in the longitudinal direction.
, 14d is provided on the member 14 related to at least one member 14d, the number of parts can be reduced and the mechanism simplified, thereby making it possible to downsize and lower the cost of the device.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tape guide device of the present invention will be described in detail below with reference to FIG. FIG. 1 is an exploded perspective view of the tape guide device of the present invention. In FIG. 1, 21 is a guide member made of ceramic, 24 is an ultrasonic vibrator, and 19 is a support shaft. 19b is a ring-shaped support protrusion, and as shown in the figure, this support protrusion 19b is
They are provided at positions spaced a distance n from the upper end and the lower end of the support shaft 19, respectively, inwardly. 12 is an upper flange (guide flange), and 14 is a rotation preventing member formed integrally with the lower flange 14d. 28 is a stopper plate, and this stopper plate 28 is connected to the screw 27 and the screw hole 1 of the rotation prevention member 14.
4b to fix it to the rotation prevention member 14. The ultrasonic vibrator 3 placed at a predetermined position of the anti-rotation member 14 is held between the stopper plate 28 and one end surface of the ultrasonic vibrator 24 and the surface of the guide member 21 are bonded, for example, to form a guide. Rotation of the member 21 is prevented. Reference numeral 25 denotes a terminal plate, and the terminal plate 25 is fixed to the rotation prevention member 14 through screws 26 and screw holes 14c of the rotation prevention member 14. Reference numeral 29 denotes a rotation prevention pin on the base 32 that prevents the tape guide device 17 from rotating.

In assembling this tape guide device 17, the stepped portion 19a on the end surface of the support shaft 19 is fitted into the hole 14e of the detent member 14, and the guide member 21 is attached to the support shaft 19.
, so that the ultrasonic vibrator 24 is sandwiched between the recess 14a of the detent member 14 and the stopper plate 28,
The upper flange 12 is fitted into the stepped portion 19a of the support shaft 19, and the lead wires 30a and 30b of the ultrasonic vibrator 24 are connected to the terminal plate 25 by, for example, soldering. As shown in the figure, in this example, the length a excluding the stepped portions 19a at both ends of the support shaft 19 is approximately 0.1 mm longer than the length b of the guide member 21, and the upper flange 12 and the lower flange 14 are
The distance may be approximately 0.1 mm shorter than the distance d.

FIG. 2 shows a case where the tape guide device 17 is attached to a base 32 after each tape guide device 17 is assembled. Hereinafter, the explanation will be given with reference to FIGS. 2 and 3, respectively.
4, parts corresponding to those in FIG. 1 are given the same reference numerals, and detailed explanation thereof will be omitted. In this Fig. 2, 33 is a main shaft (see Fig. 4), and this main shaft 33 is connected to the base 3.
Attach it as if it were planted in 2. A coil spring 34 is inserted into this main shaft 33, and a tape guide device 17 is inserted into this main shaft 33.
The support shaft 19 is inserted into the hollow part 19c (see FIG. 1), and the rotation stopper pin 29 is fitted into the hole 32a provided in the base 32. Thereafter, the height adjustment screw 36 is screwed into the threaded portion 33a provided at the end of the main shaft 33. By rotating the height adjustment screw 36, the height of the tape guide device 17 can be adjusted by or against the biasing force of the coil spring 34. The height adjustment range is approximately 0.5 mm, but the rotation pin 29 is inserted into the hole 32a of the base 32, for example, by 2 mm.
Since the tape guide device 17 is fitted over a depth of approximately 1.0 mm, the tape guide device 17 does not rotate around the main shaft 33 even if the height is adjusted. After the height adjustment is completed, the threaded portion 33a of the main shaft 33 is tightened using the lock screw 37 described above. This can prevent the height adjustment screw 36 from rotating. 3 is a top view of the tape guide device 17 shown in FIG. 4, and FIG. 4 is a view of the tape guide device 17 shown in FIG.
FIG. 2 is a diagram of the tape guide device 17 shown in FIG.

[0012] In such a configuration, for example, video
Connect the AC voltage from the tape recorder main body to the lead wire 30a.
When the ultrasonic wave is supplied to the ultrasonic vibrator 24 through the channels 30b and 30b, a standing wave is generated in the guide member 21. When the tape is guided and run by the tape guide device 17 in this state, the coefficient of friction due to the contact between the tape and the guide member 21 is several times higher than that when no AC voltage is supplied to the ultrasonic vibrator 24. It decreases to 1/2. The state of the standing waves generated in the guide member 21 is as shown in FIG. The support protrusions 19b in this example are positioned at a distance of approximately n from the end surface of the guide member 21, as shown in FIG. Also,
As shown in FIG. 1, the upper flange 12 can be made circular, and the detent member 14 can be manufactured by plastic molding or die casting. In this way, in this example, it is possible to reduce the number of parts and simplify the mechanism, thereby making it possible to reduce the size and cost of the tape guide device.

FIG. 5 shows another embodiment 1 of the tape guide device of the present invention. FIG. 5 will be explained below. In this FIG. 5, 130 is a tape guide device, 143
is a base, 131 is a main shaft attached to the base 143, 141 is a guide member whose material is, for example, ceramic;
144 is an ultrasonic vibrator, 139 is a support shaft, 132a and 132b are upper and lower flanges, respectively, 145 is a support shaft 13
Support rings 136 made of resin, for example, are fitted into recesses 139b provided at predetermined positions on the main shaft 131.
147 is a coil spring, and 134 is a lower flange 132b.
It is a detent pin that is installed through the A hole 143 is provided in the base 143 with one end of this rotation stopper pin 134
a, and the other end is fitted into a notch 141a provided at the end of the guide member 141. The length of the support shaft 139 is made to be approximately 0.1 mm longer than the length of the guide member 141, and approximately 0.1 mm shorter than the distance between the upper and lower flanges 132a and 132b. Please refer to Figure 1 for assembly etc.
Since many parts are similar to the tape guide device 17 described in , detailed explanation thereof will be omitted. Now, height adjustment screw 1
By rotating 36, the height of the tape guide device 130 can be adjusted by the biasing force of the coil spring 147 or against this biasing force. The range of height adjustment is approximately 0.5 mm, but since the detent pin 134 is fitted into the hole 143a of the base 143 to a depth of, for example, 3 mm, the tape guide device 13 does not rotate around the main shaft 131. In addition, the upper and lower flanges 132a
and 132b can each be circular, as shown in FIG. In this way, in this example, it is possible to reduce the number of parts and simplify the mechanism, thereby making it possible to reduce the size and cost of the tape guide device.

FIG. 7 shows another embodiment 2 of the tape guide device of the present invention. This FIG. 7 will be explained below. In this FIG. 7, 150 is a tape guide device, 151
1 is a base, 154 is a main shaft attached to this base 151, 152 is a guide member made of ceramic, and 15
3 is an ultrasonic vibrator, 154a is a boss provided on the main shaft 154, 154b is a support protrusion provided at a predetermined position on the main shaft 154, and 155 is a pull-out screwed into a threaded portion 154d provided at the end of the main shaft 154. Lock nut, 156 is boss 15
This is a detent pin installed so as to stand on 4a. The end of this detent pin 156 is connected to the guide member 15.
It is inserted into the notch 152a provided at the end of 2. As shown in the figure, in this example, the relationship between the distance a between the upper end of the boss 154a of the main shaft 154 and the shoulder 154c, and the length b of the guide member 152 is a b + 0.1
Make it so that The retaining nut 155 has a shoulder portion 154
Since the guide member 152 is assembled between the upper end of the boss 154a and the lower end of the retaining nut 155, a gap of approximately 0.1 mm will be created. Further, a slight gap is created between the inner diameter of the guide member 152 and the outer diameter of the main shaft 154, so that the guide member 15
2 is rotatable around the main shaft 154, but the guide member 152 does not rotate around the main shaft 154 because the locking pin 156 is inserted approximately 0.5 mm into the notch 152a. Thus, in this example,
It is possible to reduce the number of parts and simplify the mechanism, thereby making it possible to reduce the size and cost of the tape guide device.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0016]

According to the present invention described above, the rotation prevention means for preventing rotation of the guide member is provided in a member related to at least one of the members regulating the longitudinal position of the guide member. By doing so, it is possible to reduce the number of parts and simplify the mechanism, which has the advantage of reducing the size and cost of the device.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the tape guide device of the present invention.

FIG. 2 is a diagram showing an embodiment of the tape guide device of the present invention.

FIG. 3 is a top view showing an embodiment of the tape guide device of the present invention.

FIG. 4 is a diagram showing an embodiment of the tape guide device of the present invention.

FIG. 5 is a diagram showing another embodiment 1 of the tape guide device of the present invention.

FIG. 6 is a top view showing another embodiment 1 of the tape guide device of the present invention.

FIG. 7 is a diagram showing another embodiment 2 of the tape guide device of the present invention.

FIG. 8 is a top view showing another embodiment 2 of the tape guide device of the present invention.

FIG. 9 is a sectional view showing an example of a conventional tape guide device.

FIG. 10 is a plan view showing an example of a conventional tape guide device.

FIG. 11 is a graph for explaining examples of the conventional tape guide device and the tape guide device of the present invention.

[Explanation of symbols]

12 Upper flange 14 Anti-rotation member 14d Lower flange 19 Support member 21 Guide member 24 Ultrasonic vibrator 27 Screw 28 Stopper plate

Claims (1)

[Claims] 1. A pipe-shaped guide member that guides a tape, an ultrasonic vibrator that has one end free and the other end fixed to the guide member and vibrates the guide member with standing waves, and the guide member In the tape guide device, the rotation prevention means for preventing rotation of the guide member is a member related to at least one of the members regulating the longitudinal position of the guide member. A tape guide device characterized in that it is provided in.